【Objective】The aim of this study was cloning aputative xyloglucan endotransglucosylase/ hydrolase gene(PeXTH)of Populus euphratica and analyzing its role in Cd2+tolerance of transgenic tobacco plants.【Method】The PeXTH gene was isolated from Populus euphraticaleaves by RT-PCR.The full-length cDNA of PeXTH was cloned into the expression vector pGreen0029,and then the recombinant pGreen0029-PeXTH was transferred into tobacco plants through Agrobacterium-mediated method.AntiCd2+characters of the transgenic line...